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Control device and control method for a secondary battery

  • US 9,906,060 B2
  • Filed: 07/09/2014
  • Issued: 02/27/2018
  • Est. Priority Date: 09/06/2013
  • Status: Expired due to Fees
First Claim
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1. A control device for a secondary battery using, as positive electrode material, positive electrode active material made of solid solution material, comprising:

  • a voltage detecting unit configured to detect an actual open circuit voltage value of the secondary battery;

    a current detecting unit configured to detect an actual current value of the secondary battery;

    an SOC detecting unit configured to detect an actual state of charge value on a basis of the actual current value of the secondary battery;

    a memory unit configured to store a voltage-SOC standard control curve which shows a relation between an open circuit voltage value of the secondary battery and a state of charge value;

    a presumed voltage calculating unit configured to calculate a presumed voltage value on the basis of the actual state of charge value detected by the SOC detecting unit and the voltage-SOC standard control curve stored in the memory unit;

    a determining unit configured to determine a difference between the actual open circuit voltage value detected by the voltage detecting unit and the presumed voltage value calculated by the presumed voltage calculating unit; and

    a control unit configured to at least perform a discharge process so as to make the difference between the actual open circuit voltage value and the presumed voltage value smaller before a next charge process when the difference is determined higher than a predetermined range by the determining unit.

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